Pipes & Cisterns · Question 20 · Easy
Pipes & Cisterns question 20
A 4,500-litre tank is filled by two pipes delivering 30 litres per minute and 20 litres per minute. If both are opened together on the empty tank, how long will it take to fill?
- 90 minutes
- 100 minutes
- 75 minutes
- 150 minutes
Answer and explanation
Answer: A. 90 minutes
Explanation: Combined flow = 30 + 20 = 50 litres per minute, so time = 4,500 ÷ 50 = 90 minutes.
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